NPPES file of Aug 9, 2026

Internal Medicine Physician in California

17,696 NPPES records list internal medicine physician with a practice address in California, 45 per 100,000 residents, the 17th highest rate of 51. Los Angeles and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 45 of 354.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Los Angeles has the most, 1,423

  1. Los Angeles1,423
  2. San Francisco1,318
  3. San Diego961
  4. Sacramento601
  5. Oakland432

Internal Medicine Physician records in California

  1. Maristela Carreon, M.D.Merced, CA 953401376693952
  2. Jorge Carrera, MDEncinitas, CA 920241184728586
  3. Carlos Carriedo, DOSan Ysidro, CA 921731174217434
  4. Catherine Carroll, MDSan Diego, CA 921281952627937
  5. Matthew Carroll, MDRoseville, CA 956611154409894
  6. William CarrollLos Angeles, CA 900951295154102
  7. William Carroll, M.D.Santa Rosa, CA 954031922005891
  8. Paula Carruthers, M.D.Beverly Hills, CA 902111225040843
  9. Cindy Carson, MDPasadena, CA 911061891982633
  10. Scott Carstens, M.D.San Diego, CA 921301073618831
  11. James Carter, MDChico, CA 959281699838094
  12. Melvin Carter, M.D.Salinas, CA 939071134125636
  13. Russell Carter, MDManteca, CA 953361528049988
  14. Thomas Carter, M.D.La Jolla, CA 920371912952052
  15. Joseph Cartwright, MD, MEDOakland, CA 946051356795488
  16. David Carty, MDPoway, CA 920641205802568
  17. Melissa Carucci, MDAntioch, CA 945311376621813
  18. John Carvalho, M.B.B.S.Hemet, CA 925431386170017
  19. Slaton CaseSan Francisco, CA 941181093298044
  20. Stephen Casey, M.D.Redding, CA 960011902973480
  21. Yas CaseyLoma Linda, CA 923571336568971
  22. Gina Casian, M.D.Coronado, CA 921181568677151
  23. Alejandra Casillas, M.D.Los Angeles, CA 900241205026721
  24. Moira Casillas, MDLos Angeles, CA 900271851450415
  25. Bruce Adrian Casipit, MDLoma Linda, CA 923541760050843
  26. Morgan Casper, MDSacramento, CA 958171902555881
  27. Paul Cassedy, M.D.Laguna Hills, CA 926531417159948
  28. Julia Cassetta, M.D.La Canada, CA 910111548279383
  29. Cathy Castagna, D.O.Sacramento, CA 958251295078301
  30. Araceli Castanares, M.D.Bakersfield, CA 933011356423669
  31. Garland Castaneda, MDAlameda, CA 945011740676881
  32. Leon Castaneda, MDSan Jose, CA 951191942629399
  33. Luciano Castaneda, MDValencia, CA 913551508202078
  34. Nicandro Castaneda, M.D.Santa Maria, CA 934541578595245
  35. Christine Castano, MDArcadia, CA 910061225076268
  36. Romeo Castillo, MDHuntington Park, CA 902551659345403
  37. Laura Castillon, MDGoleta, CA 931111700580966
  38. Kristin Castorino, D.O.Santa Barbara, CA 931051396879920
  39. Astred CastroSacramento, CA 958171134821176
  40. Carol Castro, MDLos Angeles, CA 900171740770072
  41. Charissa Castro, MDBellflower, CA 907061922175934
  42. Melanio Castro, MDStockton, CA 952101881772697
  43. Robert Castro, DOSanta Ana, CA 927041285777813
  44. Laura Castro Castrezana, MDHuntington Park, CA 902551134832108
  45. Jason Cataldo, D.O.Novato, CA 949491477852648
  46. Stuart Cataldo, MDEureka, CA 955031962507590
  47. Michael Catapano, M.D.Sacramento, CA 958161619901758
  48. Richard Cathey, M.D.San Jose, CA 951161750343323
  49. Joannie Cathey Cook, MDLos Angeles, CA 900371780737981
  50. Joy Catolico, MDWalnut Creek, CA 945981861570954

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 17 of 51 per resident

  1. New Jersey50
  2. New Hampshire48
  3. Minnesota46
  4. California45
  5. Florida45
  6. Ohio45
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

79.5% of these records appear in a Medicare file, against 78.7% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California79.5%
  2. United States78.7%

Internal Medicine Physician records in California, measured

  • In a Medicare file14,068 of 17,696 · 79.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file11,077 · 62.6% here, 61.4% nationally
  • Not updated in five years or more10,832 · 61.2% here, 55.4% nationally
  • Median graduation year2004 · the 11,065 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

17,696 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in California: 45 per 100,000 residents against 44 nationally (50 states and D.C.). Los Angeles has 1,423 of them (8%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300

States with a similar rate per 100,000

  1. Minnesota45.9
  2. Ohio44.8
  3. New Hampshire48.0
  4. Maine42.8

The largest states

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300
  5. Illinois7,238

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.